Cartoonist Stjepan Šejić reveals the one costume Batman doesn't display in the Batcave, the one he reserves only when the heat in Gotham has become intolerable.

Šejić is a prolific comic book artist, but if you haven't seen his goofier doodles on deviantART, I highly recommend checking them out. Someone really needs to give this guy a superhero humor comic to write and draw.